[PATCH] powerpc/perf: Fix for core/nest imc call trace on cpuhotplug

[Anju T Sudhakar <anju@linux.vnet.ibm.com>]

Nest/core pmu units are enabled only when it is used. A reference count is      
maintained for the events which uses the nest/core pmu units. Currently in      
*_imc_counters_release function a WARN() is used for notification of any        
underflow of ref count.                                                         
                                                                                
The case where event ref count hit a negative value is, when perf session is    
started, followed by offlining of all cpus in a given core.                     
i.e. in cpuhotplug offline path ppc_core_imc_cpu_offline() function set the     
ref->count to zero, if the current cpu which is about to offline is the last    
cpu in a given core and make an OPAL call to disable the engine in that core.   
And on perf session termination, perf->destroy (core_imc_counters_release) will 
first decrement the ref->count for this core and based on the ref->count value  
an opal call is made to disable the core-imc engine.                            
Now, since cpuhotplug path already clears the ref->count for core and disabled  
the engine, perf->destroy() decrementing again at event termination make it     
negative which in turn fires the WARN_ON. The same happens for nest units.      
                                                                                
Add a check to see if the reference count is alreday zero, before decrementing  
the count, so that the ref count will not hit a negative value.                 
                                                                                
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>                
---
 arch/powerpc/perf/imc-pmu.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 9ccac86f3463..e3a1f65933b5 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -399,6 +399,20 @@ static void nest_imc_counters_release(struct perf_event *event)
 
 	/* Take the mutex lock for this node and then decrement the reference count */
 	mutex_lock(&ref->lock);
+	if (ref->refc == 0) {
+		/*
+		 * The scenario where this is true is, when perf session is
+		 * started, followed by offlining of all cpus in a given node.
+		 *
+		 * In the cpuhotplug offline path, ppc_nest_imc_cpu_offline()
+		 * function set the ref->count to zero, if the cpu which is
+		 * about to offline is the last cpu in a given node and make
+		 * an OPAL call to disable the engine in that node.
+		 *
+		 */
+		mutex_unlock(&ref->lock);
+		return;
+	}
 	ref->refc--;
 	if (ref->refc == 0) {
 		rc = opal_imc_counters_stop(OPAL_IMC_COUNTERS_NEST,
@@ -646,6 +660,20 @@ static void core_imc_counters_release(struct perf_event *event)
 		return;
 
 	mutex_lock(&ref->lock);
+	if (ref->refc == 0) {
+		/*
+		 * The scenario where this is true is, when perf session is
+		 * started, followed by offlining of all cpus in a given core.
+		 *
+		 * In the cpuhotplug offline path, ppc_core_imc_cpu_offline()
+		 * function set the ref->count to zero, if the cpu which is
+		 * about to offline is the last cpu in a given core and make
+		 * an OPAL call to disable the engine in that core.
+		 *
+		 */
+		mutex_unlock(&ref->lock);
+		return;
+	}
 	ref->refc--;
 	if (ref->refc == 0) {
 		rc = opal_imc_counters_stop(OPAL_IMC_COUNTERS_CORE,
-- 
2.14.1