perf/x86/intel/uncore: Clean up hardware on exit

When tearing down the boxes nothing undoes the hardware state which was setup
by box->init_box(). Add a box->exit_box() callback and implement it for the
uncores which have an init_box() callback.

This misses the cleanup in the error exit pathes, but I cannot be bothered to
implement it before cleaning up the rest of the driver, which makes that task
way simpler.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20160222221011.023930023@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 42ea435e5ead..c3d1cbbaa917 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -937,6 +937,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
 		raw_spin_lock(&uncore_box_lock);
 		list_del(&box->list);
 		raw_spin_unlock(&uncore_box_lock);
+		uncore_box_exit(box);
 		kfree(box);
 	}
 	return ret;
@@ -982,6 +983,7 @@ static void uncore_pci_remove(struct pci_dev *pdev)
 	}
 
 	WARN_ON_ONCE(atomic_read(&box->refcnt) != 1);
+	uncore_box_exit(box);
 	kfree(box);
 
 	if (last_box)
@@ -1091,8 +1093,10 @@ static void uncore_cpu_dying(int cpu)
 			pmu = &type->pmus[j];
 			box = *per_cpu_ptr(pmu->box, cpu);
 			*per_cpu_ptr(pmu->box, cpu) = NULL;
-			if (box && atomic_dec_and_test(&box->refcnt))
+			if (box && atomic_dec_and_test(&box->refcnt)) {
 				list_add(&box->list, &boxes_to_free);
+				uncore_box_exit(box);
+			}
 		}
 	}
 }