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

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>
Reviewed-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 9ccac86..e3a1f65 100644 (file)
--- 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,